Some GF-5 oils carry API CF so its suitable for a CF application. In reality it's never going to perform well in a late model light duty diesel. ACEA C2 would be the closest spec to GF-5 that combines good diesel performance. The anti wear performance is likely OK for many applications as many light diesel are not that different to their gasoline counterparts but GF-5 is not designed to cope with the soot and the associated problems, thickening, piston deposits, sludge.